Improved elevating-machine



nAviD L. MILLER, or MADrsomNEwJEnsEr 'IMPRovED EL-EVATING-MACHLN ,Af l!Specication forming part of`Letters Patent No. 34,2110, dated lebjruary18,1862.

To @ZZ whom it may concern,.-

Be it known that I, DAVID L. MILLER, of Madison, in the county of Morrisand State of New Jersey, have invented a new and ImprovedElevatingMachineg and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, making a part of this specifica-tion, in which-Figure l is a side elevation of my inproved elevating-machine. Fig. 2 isa plan of the same. Fig. 3 is a fragmentary transverse section of thesame, taken in the line ma of Fig. 1.

Similar letters of reference indicate correspending parts in the severalfigures.

This invention relates to that class of portable elevating-machineswhich are mounted upon wheels and used in clearing new-made land ofstones and stumps; and it consists in the manner of arranging thewindlass so as to cause the strain in lifting to be equally divided uponthree wheels.

It also consists in the manner of operating the windlass by a worm-screwand wormwheel, whereby a continuous motion is given to the windlass andgreat power obtained, the worm-screw being so arranged in relation tothe Wheel that it can be easily disengaged therefrom to allow thewindlass to be operated with greater speed when it is desired to unwindor wind up the chain preparatory to applying the power to elevate thestump or stone from its bed.

To enable others skilled in the art to fully understand and construct myinvention, I will proceed todescribe it.

A represents a platform upon which the men stand to operate thewindlass, which is supported at its front and back. ends upon bolsters BC, resting upon and secured to the longitudinal beams a on b b', whichextend the entire length of the machine and are mounted in front uponone wheel D and at the back end upon two wheels E E', all of which havea wide tread. The axles of the hind wheels revolve in suitable boxesattached to the under side of the longitudinal beams. The wheel D, whichsupports the front end of the machine, runs in a swivel stirrup F, whichis attached in the middle of the bolster by a king-bolt.

1 is a box-frame of great strength, in which the windlass Lis fitted torevolve in journal i boxes c d. This frame issupported over'the middleof the machine, which is left open, by a strut G at the backend andinclined brace II at the front, which are secured at their lower ends bybolts, the former to the longitudinal beams and the latter to the middleof the bolster C in front. The timbers forming the strut are connectedtogether at their lower ends by a rod cto prevent them from springingapart when under great strain.

The windlass L at each end projects through its j ournal-boxes and issquared on its extremities to receive Winches, by means of which it isrevolved to unwind or wind up the draft-chain 'i when not under strain.

Secured to the windlass L on the inside of the box and adjacent theretois a worm-wheel J, into which a worm-screw K, placed at right angles toit, meshes to impart motion to the windlass. The shaft of the worm-screwis iitted in boxes f g, one of which f on one side of the windlass ispivoted to the side plate h of the box d, and the other on the oppositeside is provided with a projection on the back side, which is adapted toslide in a slot in the side plate to raise that end of the worm-screwand thus disengage it from'the worm-wheel to allow the windlass to berotated more ex peditiously by Winches on its ends. The ends of theworm-screw project through their boxes in the same manner as thewindlass to receive Winches by which the power is applied through theworm-screw and wheel to operate the windlass. In this manner ofoperating the windlass a very slow motion will be had; but great powercan be exerted by one or two men taking hold of the Winches of thescrew. At the same time all recoil or reaction is prevented Withoutrequiring the use of pawl or ratchet for this purpose.

It is important, in view of the slow motion of the windlass when actedupon by the wormscrew, to give a rapid motion to the windlass inunwinding or winding up the draft-chain t' preparatory to applying thepower to lift the stone or stump; hence the object in pivoting one ofthe boxes in which the worm-screw isv journaled, so that the oppositeend of the screw can be raised and disengaged from the worm-wheel, andthus allow the windlass to be rotated with greater speed.

The draft-animals to propel the machine over the ground are hitched tothe tongue m,

raise the stone or stump from its bed toV an f elevated position, inwhichrposition it is held by the worm-screw while being carried to anyplace it is intended to leave it.

Having thus described my invention, what I claim as new, and vdesire tosecure by Letters Patent, is Y The worm-screw K and manner of arrangingthe boxes f gof the same, so that it can be easily disengaged from theworm-wheel J,

'in combination therewith and with the windlass L, draft-chain c',box-frame I, inclined strut G and brace H, platform A, and longitudinalbeams a a b b', the whole mounted upon wheels and arranged in the mannerand for the purpose set forth.

' DAVID L. MILLER.y

Witnesses:

R. GAWLEY, JAMES LAIRD.

